Hey i recently made a new block with just one new class called mod_RubyBlock.class.
I have modloader installed and I have even tried to install modloader again. Whenever I try to run minecraft it just crashes and gives this message. is it a problem with my class? please help I neeed this mod to works
Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Exception occured in ModLoader

A full error report has been saved to /Users/BrendanCarey/Library/Application Support/minecraft/crash-reports/crash-2013-01-24_22.01.16-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT 6cd05829 --------
Full report at:
/Users/BrendanCarey/Library/Application Support/minecraft/crash-reports/crash-2013-01-24_22.01.16-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 1/24/13 10:01 PM

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Mac OS X (x86_64) version 10.8.2
Java Version: 1.6.0_37, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 500016136 bytes (476 MB) / 534708224 bytes (509 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx1024M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: ModLoader, EntityRendererProxy, ModTextureStatic, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
ModLoader: Mods loaded: 1
ModLoader 1.4.7


java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at ModLoader.addMod(ModLoader.java:371)
at ModLoader.readFromClassPath(ModLoader.java:1317)
at ModLoader.init(ModLoader.java:908)
at ModLoader.addAllRenderers(ModLoader.java:215)
at bbu.<init>(RenderManager.java:94)
at bbu.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Thread.java:680)
--- END ERROR REPORT 322686fc ----------

is it a problem in my class file?